Expansion valve



FIG. 1 is a perspective view of an expansion valve showing our new design;

FIG. 2 is a front, elevation view thereof;

FIG. 3 is a top, plan view thereof;

FIG. 4 is a bottom, elevation view thereof;

FIG. 5 is a left-side, elevation view thereof; and,

FIG. 6 is a right-side, elevation view thereof.

The broken line showing unclaimed portions in FIGS. 5 and 6 forms no part of the claimed design 

The ornamental design for an expansion valve, as shown and described. 